C1 (cervical vertebra)C1 is the first cervical (neck) vertebra which is called the atlas. It supports the head.

C1-C7 (cervical vertebrae)C1 through C7 are the symbols for the cervical (neck) vertebrae, the upper 7 vertebrae in the spinal column (the vertebral column).

C2 (cervical vertebra)C2 is the symbol for the second cervical vertebra, which is also called the axis. It is so-named because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of the second cervical vertebra. The joint between the axis and atlas is a pivot type of joint. It allows the head turn.

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